<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <h1>helloworld</h1>
    {% for item in arr %}
    <p>{{item}}</p>
    {% endfor %}

    <!-- {% if isShow %}
    <p>show</p>
    {% endif %} -->
</body>
</html>